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English definition of “guinea pig”

guinea pig

noun [C] (TEST)   
a person used in a scientific test, usually to discover the effect of a drug on humans: They're asking for students to be guinea pigs in their research into the common cold.Inventing, designing and innovationCreating and producing
(Definition of guinea pig noun (TEST) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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